The incorporation of additives designed to sacrificially react on the surface of cathode materials in lithium ion batteries has been investigated. Addition of low concentrations of either 2,5-dihydrofuran or γ-butyrolactone to 1 M in 1:1:1 ethylene carbonate/diethyl carbonate/dimethyl carbonate improves the capacity retention of cells cycled at 4.9 V vs Li. A surface analysis of the cathode materials (X-ray photoelectron spectroscopy and IR) suggests that the structure of the cathode surface film is modified by the presence of the additives resulting in a decrease in detrimental electrolyte oxidation reactions on the cathode surface.
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Yang et al. (2009) studied this question.
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